Images show high level of activity at North Korea nuclear site: monitor

WASHINGTON (Reuters) - Recent satellite images show a high level of activity at North Korea's nuclear test site but it is unclear whether this was for maintenance or preparation for a fifth nuclear test, a U.S.-based North Korea monitoring project said on Monday.

A report on the 38 North website said the commercial satellite imagery from July 7 was not of sufficiently high resolution to determine the exact nature of the activity at the Punggye-ri test site, but it added:

"It is clear that North Korea is ensuring that the facility is in a state of readiness that would allow the conduct of future nuclear tests, should the order come from Pyongyang."

The report on 38 North, which is run by Johns Hopkins University's School of Advanced International Studies, said the imagery showed stacked supplies or equipment and what could be mine ore carts, suggesting a tunnel was being actively worked on.